As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RECEIVING AN AIR/GND FAIL MESSAGE ON THE EICAS DURING TAKEOFF CLIMB. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE NLG WOW PROXIMITY SENSOR HARNESS. OPERATIONAL CHECK OF THE LANDING GEAR EXTENSION AND RETRACTION WAS SATISFACTORY.